Brake-block.



PATENTED AUG. 4, 1903. WHITMORE.

BRAKE APPLIOATION FILED OGK.

JULY 19, 1900.

N0 MODEL.

UNITED STATES Patented August 4, 1903.

PATENT OFFICE.

BRAKE-BLOCK.

SPECIFICATION forming part of Letters Patent N 0. 735,636, dated August4, 1903.

V Application filed July 19, 1900; Serial No- 24,Z39. (Nomodeh) To allwhom, it may concern:

Be it known that I, OscAR WHtTMoRn, a citizen ofthe United States,residing at San Diego, in the county of San Diego and State ofCalifornia, have invented a new and useful Improvement in- Brake-Blocks,of which the following is a specification.

The object of this invention is to provide superior means forautomatically turning the brake-block to throw the top thereof away fromthe wheel when the brake is released.

It is the object of my invention to simplify the construction andincrease the facility of adjustment of the brake-block to a desiredposition and the block-throwing spring to a desired tension.

The invention is applicable in various forms.

The accompanying drawings illustrate my invention in two modes of itsapplication.

Figure I is a sectional view of my invention in one form of itsapplication. Line I I, Fig. II, indicates the line of section. Fig. IIis a section on line II II, Fig. I. Fig. III is a sectional view ofanother form ofmy invention as applied to a wooden brake-block. Line IIIIII, Fig. IV, indicates the line of section. Fig. IV is a sectional viewon the line IV IV of Fig. III.

In Figs. I and II, a indicates the brakeshaft furnished with a taperportion 1 and a screw-threaded portion 2. .1) indicates a brakeblock toturn on said shaft and furnished with a chamber 3 about the taperportion. 0 indicates a washer furnished with a springretainer 5andchambered in the chamber and also furnished with a projection 6,which extends through the wall of the chamber toward the end of theshaft to form a journal for the block. 01 indicates a spring in thechamber, interposed between the spring-retainer 5 and the block b tothrow the block. 6 indicates a nut outside of the chamber, screwed ontothe shaft and engaging the projection 6 of the washer to force thewasher onto the taper. The walls to w of the block are respectivelyjournaled on the shaft and on the projection 6. 7 indicates a lug insidethe block to hold the spring in position, so that it will not beWithdrawn from the spring-retainer 5 of the washer c.

In Fig. III the block b may be of wood.

The shaft a is block from moving inward. 8 indicates a washer betweenthe block b and the shoulder s. findicates a plate fastened'to the blockby screws g. 3' indicates a recess in the block to receive the platef,which is provided with a spring-retainer 10. 0 indicates a washer tofit'the taper 1 of the shaft and seated in the recess or chamber 3', inwhich is mounted the spring d, which is an open ring, the ends of whichare spread apart and rest against the springretainers 5 and 10 tonormally hold them together. e indicates the nut screwed upon the shaftto force the washer 0 onto the tapered portion of the shaft.

In practicaluse the block will be adjusted to operative position byloosening the nut e e, turning the block into the position in which itis normally to stand, and then firmly screwing the nut e e, as the casemay be,into place. The taper portion of the shaft wedges the washer andprevents it from turning. The spring will then normally throw theblockin the position to which it is thus adjusted. When the brake-blockis brought against the wheel, the upper portion thereof will engage the.wheel and throw the block against the tension of the spring to bring theblock fully against the wheel. When the brake is released, the springagain turns the block into its retracted position.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is'

1. The combination of a brake-shaft furnished with a taper portion; abrake-block to turn on said shaft; a washer fitted on the taper portionof the shaft and furnished with a spring-retainer; a spring interposedbetween the retainer and the block; and a nut screwed on the shaft toforce the washer onto the taper, and to hold the block in place. 7

2. The combination of a brake-shaft furnished with a taper portion; abrake-block to turn-on said shaft and furnished with a chamber about thetaper portion; a washer furnished with a spring-retainer and chamberedin the chamber and fitted on the taper portion of the shaft; a spring insaid chamber interposed between the retainer and the block; and a nutscrewed on the shaft to force the washer onto the taper and to hold theblock in place.

shouldered at s to prevent the h 3. The combination of a brake-shaftfurnished with a taper portion; a brake-block to turn on said shaft andfurnished with a chamber about the taper portion; a washer furnishedwith a spring-retainer and chambered in the chamber and also furnishedwith a projection which extends through the Wall of the chamber, towardthe end of the shaft to form ajonrnal for the block; a spring in thechamber interposed between the spring-retainer and the block to throwthe block; and a nut outside the chamber screwed onto the shaft andengaging the projection of the washer to force the washer onto thetaper.

4. The combination of a brake-shaft furnished with a taper portion and ascrewthreaded portion; a brake-block to turn on said shaft and furnishedwith a chamber about the taper portion; a washer seated in the chamberand fitting the taper portion; a nut outside the chamberand screwed uponthe shaft to force the washer onto the taper and to hold the block inplace; and a spring constructed I to turn the block and held by thewasher from turning on the shaft.

5. The combination of a brake-shaft furnished with a taper portion and ascrewthreaded portion; a brake-block to turn on the shaft and furnishedwith a chamber about the taper portion; a spring in said chamber; awasher seated in the chamber and fitting the taper portion and furnishedwith a springretainer and with a projection extending through the wallof the chamber toward the end of the shaft; portions of the block beingjonrnaled on the shaft and on the projection; and a luginside the blockto prevent the withdrawal of the spring from the spring-retainer.

In testimony whereof I have signed this specification,in the presence oftwo witnesses, at San Diego,Galifornia,this 12th day of July, 1900.

OSCAR WI-IITMORE.

Witnesses:

J. C. HIZAR, W. H. PRINGLE.

